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    Short-Wavelength Reactor Neutrino Oscillations with the PROSPECT Experiment

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    Genre
    Thesis/Dissertation
    Date
    2019
    Author
    Landschoot, Danielle
    Advisor
    Napolitano, Jim
    Committee member
    Jones, Donald C.
    Iavarone, Maria
    Martoff, Charles Jeffrey
    Dolinski, Michelle
    Department
    Physics
    Subject
    Physics
    Nuclear Physics and Radiation
    Neutrino
    Neutrino Oscillation
    Prospect
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/2070
    
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    DOI
    http://dx.doi.org/10.34944/dspace/2052
    Abstract
    The Precision Reactor Oscillation and SPECTrum Experiment (PROSPECT) is designed to probe short baseline oscillations of electron antineutrinos in search of eV-scale sterile neutrinos and precisely measure the U-235 reactor antineutrino spectrum from the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. The PROSPECT antineutrino detector (AD) provides excellent background rejection and position resolution due to its segmented design and use of Li-6-loaded liquid scintillator. In order to understand relative volume variation effects, which could affect an oscillation measurement, Ac-227 was added as a calibration source that was dissolved isotropically throughout the liquid scintillator. Using the correlated production of alphas from Rn-219 -> Po-215 -> Pb-211 in the Ac-227 decay chain I measured the rate of Ac-227 in each segment of the detector as well as the decay rate of Ac-227 events over the lifetime of the detector. The measured Ac-227 half-life suggests a rate of events falling 1.56 +/- 0.21% faster than expectation. The results of these studies were then applied as corrections to the measurement of antineutrino event rates as a function of distance from the reactor. This thesis will present the testing of Ac-227 as a calibration source before its addition to the AD, analysis methods, results of Ac-227 in the AD, and its application to the oscillation analysis.
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